* DC is read from physical VRAM. WC is the result of LOP on SC and DC and is the data that will be written. WC is the data that is masked using the write mask.
==== Write Mask ====
* R46 (Write mask) is used when writing to physical VRAM0.
So you need to know when each mask register is used and you need to understand the logical->physical VRAM mapping.
===== Write Mask in bitmap and standby modes =====
* Even logical VRAM addresses (logical address bit 0 = 0) map to VRAM0 and use R46 for masking.